I have a Iphone and have been loading Ham applications onto it… Below is a list of some of them.

Amateur Radio Exam Prep for iPhone – Amateur Radio License exams are composed of questions from a pool. Use this application to practice all possible questions prior to taking your exam

CallBook for iPhone– CallBook is an Amateur Radio application that allows you to look up call signs via the free WM7D server, the QRZ Online subscription service or the HamCall subscription server and track active APRS stations on www.aprs.fi. Lookup results can be emailed and the QTH can be instantly viewed in the Maps application

FreqLoader: iPhone companion for the mobile ham– FreqLoader is the perfect iPhone/iPod Touch companion for amateur radio operators, monitoring enthusiasts, shortwave listeners and anyone with an interest in the air waves. Whether you’re an active licensed ham or an avid scanner listener, FreqLoader will allow you to find what you’re looking for, keep track of your stations, maintain complete logs and share your finds with friends, groups and the world.

iLocator for iPhone – A small application for Apple iPhone that calculate grid locator from gps, wifi or gsm cells by IW2BSQ

iPhone Ham Radio Callsign Lookup– This webapp provides an iPhone-compatible lookup of Amateur Radio Callsigns. It provides the name, address, and license class (from the FCCÃ¢â‚¬â„¢s public records) of any US-Licensed Amateur Radio Operator.